Lower resolution first
Resolution has the biggest impact on file size. Reducing from 4K to 1080p or 720p can shrink a video by 50-75% with minimal visible quality loss on screens.
Video size reduction
How to Reduce Video File Size
Large video files are hard to share, upload and storeLessMB helps reduce video file size locally in your browser by adjusting resolution, bitrate and compression settings
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Select a video and use the compressor below to reduce file size.
Drop your file here, or
Compress and convert MP4, MOV, MKV, AVI, and more locally without installing software.
Files stay on your device
MP4 · MOV · WebM · MKV · AVI
No upload required100% free foreverWorks in your browser
Steps
Quick workflow
Use this simple browser workflow to get a smaller file while keeping the original on your device
- Select your video file.
- Choose MP4 output format.
- Lower resolution to 1080p or 720p.
- Use Standard compression mode.
- Download and compare the file size.
What to know before you start
Adjust bitrate and FPS
Lower bitrate reduces data per second. Lower FPS (24 or 30) is fine for most content. Both settings compound with resolution for maximum savings.
Use MP4 for compatibility
MP4 with H.264 encoding is the most compatible output format. It works on all devices, browsers and platforms.
FAQ
How to Reduce Video File Size FAQ
Short answers for the most common questions about this workflow and LessMB's local browser compression
No uploadFree toolBrowser-based
How much can I reduce video file size?
Reducing resolution from 4K to 1080p typically saves 50-75%. Combined with lower bitrate, savings can reach 80-90% for some videos.
Will the video look bad after compression?
For most content, 1080p at standard quality looks excellent on screens. Only reduce to 720p or 480p if file size is the top priority.
Are videos uploaded?
No. LessMB processes videos locally in your browser session.